Everywhere except the eastern seaboard from roughly DC north, we really don't - we have a freight rail system that occasionally hosts passenger trains, too.

It's super annoying. I hate to fly - well, that's not true; I hate the pervasive unpleasantness and inconvenience of US commercial air travel - and find trains much more congenial, but e.g. two days to get from where I live to where I grew up, plus two more days to get back, is more travel time than I can afford.

Unfortunately, while we have an activist billionaire interested in trying to improve this situation, he appears to prefer vacuum-tube moonshots, starting in the country's best-served and most infrastructurally complex transit market, to doing anything useful right now. So it goes.